Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04M—TELEPHONIC COMMUNICATION
  • H04M19/00—Current supply arrangements for telephone systems
  • H04M19/08—Current supply arrangements for telephone systems with current supply sources at the substations

Definitions

• the present invention relates to the power supply of devices connected to a telephone line.
• An object of the present invention is to provide a system for supplying a load from a telephone line which is particularly simple, which allows storage of significant energy and restitution of significant energy even during periods peak without exceeding the constraints of the telephone line.
• the present invention applies more particularly to devices such as answering machines, remote alarms, telemetry systems, modulators / demodulators (modem), payment terminals, card-payment telephones or the like.
• devices such as answering machines, remote alarms, telemetry systems, modulators / demodulators (modem), payment terminals, card-payment telephones or the like.
• the present invention provides a system for supplying a load from a telephone line comprising a rectifier connected to the terminals of the line; a capacitor supplied by the rectifier, in series with a first switch; a rechargeable battery connected to the terminals of the rectifier in series with a second switch; a switching power supply, the load being connected to the output of the switching power supply, - and a microcontroller, the power supply terminal of which is connected to the capacitor and can be connected to the battery terminal via a third switch, the microcontroller comprising means for detecting system states and for controlling in particular the first, second and third switches and the switching power supply.
• the capacitor is in series with a current limiter.
• the microcontroller is also connected to a ring detection circuit.
• the microcontroller is also connected to a reverse polarity detection system. According to an embodiment of the present invention, the microcontroller is also connected to a line break detection system.
• the microcontroller is associated with a time stamping system.
• the switching power supply comprises at the output a mass distinct from its input mass.
• the microcontroller controls the action of the limiter in series with the capacitor.
• the microcontroller controls the charging of the battery only after the capacitor is fully charged.
• the present invention applies to a telephone line L.
• a rectifier is connected to the terminals of this telephone line, for example a diode bridge 1.
• the positive terminal of the bridge is connected to a capacitor C in series with an electronic switch 5, the second terminal of which is connected to the negative terminal of the bridge, and possibly with a current limiting device 3.
• the capacitor C has an average capacity, less than 0.1 F, for example between 10 000 and 100 000 ⁇ F.
• a leakage resistance of high value 7 is connected between the second terminal of the capacitor C and the negative terminal of the bridge.
• the control terminal of switch 5 is controlled by a microcontroller ⁇ C.
• the positive terminal of capacitor C is connected to the supply terminal of the microcontroller ⁇ C. This positive terminal is connected via a switch 9 to a supply terminal 10 of the system at a voltage Vc. Switch 9 is controlled by an output from the microcontroller.
• Switches 5 and 9 are normally closed.
• the capacitor C charges via the current limiter 3, or via the leakage resistor 7 if the current limiter does not operate in the absence of microcontroller control.
• the microcontroller is supplied and on the one hand controls the limiter and on the other hand the switch 5 so that the capacitor charges at a determined voltage.
• the microcontroller starts to operate as soon as the voltage VC exceeds 1.8 volts and then this microcontroller manages the switch 5 and / or the limiter 3 so that the voltage across the terminals of the capacitor C is slightly less than 7 volts.
• Terminal 10 is also connected to a DC-DC converter, for example a DC / DC switching power supply.
• the switching power supply is controlled by the microcontroller and feeds a load L. According to an advantage of the use of such a switching power supply, it can include a primary to ground Gl of the power supply system and the microphone - controller and a secondary to ground G2 of the load.
• the system is initialized by the charge of capacitor C which then remains the main source of power for the system.
• the microcontroller has in particular means for monitoring the charge of the capacitor. When the latter is fully charged, the switch 11 is closed so that the rechargeable battery is charged via a current limiter 15. This charge may be subject to other conditions, for example occurring during hours of low telephone line usage. Then, during the operation of the system, the microcontroller will manage the closing of the switch 13 and possibly the opening of the switch 9 when the load needs a surge of energy.
• the system according to the present invention has many advantages over the use of a storage capacitor alone or a battery alone.
• the fact of using a capacitor of medium capacity allows a quick start of the system.
• the fact that the microcontroller is initially powered by the capacitor allows the recharging of the battery can be done under the control of the microcontroller which will act on the switch 11 to obtain an ideal charge which is a guarantee of long duration of life for a rechargeable battery.
• Another advantage of the mixed system is that the system continues to operate if the battery is dead or as we saw previously if the battery is not initially charged.
• FIG. 2 shows the diagram of Figure 1 in a little more detail. We find in Figure 2:
• the limiter 3 controlled by the microprocessor the switch 5 consisting of an N-channel MOS transistor
• the switch 9 consisting of a P-channel MOS transistor, in series with a diode D1,
• the microcontroller ⁇ C the switch 11 consisting of an N-channel MOS transistor, in series with a diode D2,
• the switch 13 consisting of a P channel MOS transistor, in series with a diode D3, a DC-DC converter, such as a switching power supply,
• an electronic inductor 21 intended to block the alternating current and to reduce voltage ripples as well as various detection blocks, for example a ringing voltage detection block 23, a polarity inversion detection block during assembly 25, a line break detection block 27, a block intended to have a time stamp function 29.
• the time stamp block will preferably be an integral part of the microcontroller.
• the time can be recharged by manual control or by signals sent over the telephone line.
• the coupling between the microcontroller and the load can be done by means of an optocoupler 31 to allow a logical control of elements of the load while respecting the isolation instructions.
• the system may also ment include a ring signal detector, ring energy recovery means, and means for providing a modular ring.
• the system according to the present invention is a particularly flexible system making it possible to optimize the dimensions of a storage capacitor and a rechargeable battery, while ensuring management of the entire system by a microcontroller which is initially supplied under the effect of the capacitor and which can then be maintained in the charged state under the effect of the rechargeable battery.
• the microcontroller makes it possible in particular to optimize the charging conditions of the capacitor and the battery.
• the present invention is susceptible to various variants and modifications which will appear to those skilled in the art. For example, most of the advantages of the invention will be retained if the battery is replaced by a rechargeable storage element such as a capacitor of very high capacity (greater than 10 F).

Landscapes

• Engineering & Computer Science (AREA)
• Signal Processing (AREA)
• Charge And Discharge Circuits For Batteries Or The Like (AREA)
• Devices For Supply Of Signal Current (AREA)
• Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
• Telephone Function (AREA)
• Remote Monitoring And Control Of Power-Distribution Networks (AREA)
• Direct Current Feeding And Distribution (AREA)

Priority Applications (7)

Applications Claiming Priority (2)

Publications (1)

Family

ID=9545671

Family Applications (1)

Country Status (8)

Families Citing this family (1)

Citations (5)

• 1999
  • 1999-05-12 FR FR9906242A patent/FR2793637B1/fr not_active Expired - Fee Related
• 2000
  • 2000-05-11 AU AU49287/00A patent/AU4928700A/en not_active Abandoned
  • 2000-05-11 PL PL351656A patent/PL198746B1/pl not_active IP Right Cessation
  • 2000-05-11 MX MXPA01011485A patent/MXPA01011485A/es active IP Right Grant
  • 2000-05-11 DE DE2000616584 patent/DE60016584D1/de not_active Expired - Lifetime
  • 2000-05-11 EP EP00931307A patent/EP1177673B1/fr not_active Expired - Lifetime
  • 2000-05-11 AT AT00931307T patent/ATE284595T1/de not_active IP Right Cessation
  • 2000-05-11 WO PCT/FR2000/001280 patent/WO2000070862A1/fr active IP Right Grant

Patent Citations (5)

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